Current wave indicating apparatus



Nov. 5; 1935. z J. LlSKA 2,020,195

CURRENT WAVE INDICATING APPARATUS Filed June 4, 1934 I Patented Nov.1935 .UNlTEDfSTA TES PATENT. OFFICE amass wave nqmcarmo maaa'ms-WilllamJ.Liska,erwyn,-Ill.@

Application June 4, 1934, Serial No. 728,972 '14; Claims. ;(c1. 179-175)My invention relates I more particularly to means associated with,and/operated responsive to, electrical amplifying apparatus, involving aspeaker, more especially of, the dynamictype, for

. visually indicating the wave forms of the electrical currents orvariations thereof by which the speaker is energized, and where thesound prodiiced by the speaker is within the range of audiblefrequencyfor audibly'indicating the sound f the studying of electric circuits byadding capacity or inductance thereto, the change efl'ected therebybeing rendered visible, and in the radio field is particularly useful inchecking coils, condensers, speakers, and other electrical elementsaffecting the operationv of the speaker.

While the feature of rendering the wave forms visible is ofadvantage,'this feature in combination with the feature of renderingsuch wave forms audible simultaneously, and in synchronism, with thevisual portrayal thereof, is of larger importance and value as therebythe observer is furnished a means of sensingto a much greater degree ofaccuracy, the wave forms, and performance, of the current supplied tothe speaker, rendering the apparatus much better suited to its use inthe many fields suitable for use and fields and for the special usesabove set forth.

Referring to the accompanying drawingi Figure 1 is a plan view, somewhatin the nature of a diagram, of apparatus embodying my invention, one. ofthe elements of the apparatus being shown in section and the apparatusbeing viewed at the line I on Fig. 2 and in the direction of the-arrow.

Figure-21s a view in elevation of certain of the elements shown in Fig.1; and a Figure 3, an enlarged edge view of 'a stirrupmember forming apart of the structure.

a battery represented at l, or a service supply.

in which such apparatus-is especially in the particular between the legsI 8 and In accordance with. my invention I provide a reflector, shown'asa mirror represented at 3, so associated with a part of a speaker whichis moved responsive to the varying current supplied thereto, as to causethe reflector to vibrate or 5 move into different positions, preferablyangularly, responsive to the current waves; and utilize the reflector toreflect to a receiving object, as for example a screen, a fixed beam oflight directed against the reflector.

, The speaker illustrated and shown somewhat diagrammatically and ofwell known construction, is of the dynamic type comprising a pole 7piece I of magnetic material mounted in a casing 5 and surrounded by anenergizing coil 6 constantly supplied with exciting current from any ofdirect current supply, as from direct current suitable source Thespeaker also phragm 8 which is marginal edge 9 by comprises a flexiblecone diaheld stationary at its outer the casing 5 and is slidablysupported at a tubular extension ID on its smaller -inner end on theSecured at its periphery to the diaphragm 8 and outer end of the polepiece '4.

at its yieldingcentral portion II to the outer end of the pole piece 4as by a screw I 2, is a flexible spider l3 provided for the usualpurpose.

A so-called voice coil ll surrounds, and is secured to, the sleeved"! ofthe diaphragm 8 so that these parts are movable as a unit, the diaphragm8 being vibrated responsive to changes in polarity of the voice coil l4due to the variations in the current impressed thereon.-

In the particular arrangement illustrated the 5 invention is-shown asbeing utilized for testing a radio in which case thevoice coil i4 wouldbe connected with the voice coil leads represented at I5 01' theradioapparatus which in the funcphragm 8, and an intermediate portion 20to which the reflector 3 is secured, the connections I 9 and theintermediate portion 2n being in the nature of hinges, as for example bypartially cutting through the-mateular illustrated embodiment of myinvention, the

- rial speaker having of the stirrup crosswise thereof and. along Iparallel lines as represented at 2| and 22. Thus as the diaphragm 8vibrates back and forth responsive to the current input to the voicecoil M, the mirror 3, due to the flexing of the stirrup I! by the torqueof the diaphragm in vibrating, will vibrate in response to thevibrations of the diaphragm.

The apparatus shown also comprises a lamp 23 or any other light source,for projecting a pencil beam of light, indicated at 24, against themirror 3; a revolving polygonal mirror 25, shown as of octagonal shapeand so positioned as to be impinged by the beam of light reflected bythe mirror 3 as represented at 26; a surface represented at 21 againstwhich the beam of light-reflected by the mirror 25, impinges, thissurface being by way of example a screen upon which the reflected ray oflight is rendered visible; and an element, such as apiece of groundglass or a projecting lens as shownat 28, interposed between thepolygonal mirror 25 and the screen 21 for projecting the moving'image ofthe beam on the screen 21.

As willbe readily understood from the foregoing, the light from thesource 23, striking the mirror 3 will be deflected into difierentpositions in its reflection to the rotating mirror 25 which latterreflects through the lens 28 and to the screen 2'! the beam of lightreflected to it by the mirror 3, causing the image exhibited on thescreen to be of wave form and having the characteristics of thevibrations of the mirror 3 and consequently of the current wavesimpressed upon the voice coil.

The mirror 25 may be driven in any suitable way at a constant speed andat a rate suitable to the particular conditions presented bythe-apparatus being tested. Preferably an adjustable speed motorrepresented at 29 would be employed, the motor being shown as drivingthe mirror 25 by means of a pinion 30 connected with the armature shaftof the motor and meshing with a gear 3| rigid with the mirror 25.

As will be understood according to the particperformance of the speakeris not only audibly, but visually, portrayed simultaneously responsiveto the vibrations of the diaphragm 8, permitting oi. a definiteness ofanalysis of current waves. rendered heretofore impossible because offailure to coordinate the visual and audible portrayal of the differentwaves.

While I have illustrated and described a particular apparatus embodyingmy invention, I do not wish tobe understood as intending to limit itthereto as the same may be variously modified and altered withoutdeparting from the spirit of the invention.

What I claim as new, Letters Patent, is:

1. In combination, an electrically-operated speaker having a vibratoryelement, and a structure, comprising a reflector, stationarily supportedat one portion and at another portion operatively engaging said elementand movable responsive to the vibrations of said element.

2. In combination, an electrically-operated a vibratory diaphragm, and astructure, comprising a reflector, stationarily supported at one portionand at another portion operatively engaging said diaphragm and movableand desire to secure by responsive to the vibrations of said diaphragm.

3. In combination, an electrically-operated speaker having a stationarypole-piece and a vibrating diaphragm, and a structure, comprising areflector, stationarily supported at one portion on said pole-piece andat another portion operatively engaging said diaphragm and movableresponsive to the vibrations of said diaphragm. 5

4. In combination, an electrically-operated speaker having a vibratoryelement, and a structure comprising a flexiblestirrup and a reflector onsaid stirrup between the legs of the latter, one of the legsof thestirrup being stationarily supported and the other leg thereofoperatively engaging said element whereby the reflector is movedresponsive to the vibrations of said element.

5. In combination, an electrically-operated speaker having a vibratorydiaphragm, and a structure comprising a flexible stirrup and a reflectoron said stirrup between the legs of the latter, one of the legs of thestirrup being stationarily supported and the other leg thereof 20operatively engaging said diaphragm whereby the reflector is movedresponsive to the vibrations of said diaphragm.

6. In combination, an electrically-operated speaker having a vibratoryelement, and a structure comprising a stirrup of flexible materialpresenting legs and an intermediate portion, the material of the stirrupat the junctures of said legs with said intermediate portion being ofless cross sectional area than the remainder of the stirrup, saidreflector being carried by said intermediate portion, one of the legs ofthe stirrup being stationarily supported and the other leg thereofoperatively engaging said element whereby the reflector is movedresponsive to the vibrations of the element.

7. In combination, an electrically-operated speaker having a vibratoryelement, and a structure comprising a stirrup of flexible fibrousmaterial presenting legs and an intermediate portion, the material ofthe stirrup at the junctures of said legs with said intermediate portionbeing of less cross sectional area than the remainder of the stirrup,said reflector being carried by said intermediate portion, one of thelegs of the stirrup being stationarily supported and the other legthereof operatively engaging said element whereby the reflector is movedresponsive to the vibrations of the element. I

8. In combination, an electrically-operated speaker having a vibratoryelement, and a structure comprising a stirrup of flexible materialpresenting legs and an intermediate portion, the material of the stirrupat the junctures of said legs with said intermediate portion beingpartially cut through to reduce the cross sectional area of the stirrupat these points, said reflector being carried by said intermediateportion of said stirrup, one of the legs of the stirrup beingstationarily supported and the other leg thereof operatively engagingsaid element whereby the reflector is moved responsive to the vibrationsof said element.

9. In combination, an electrically-operated speaker having a vibratorydiaphragm restrained against movement at its peripheral margin and apole-piece adjacent the center of the diaphragm and. relative to whichthe diaphragm is movable, and a structure, comprising a reflector,secured at one portion to said pole piece and at another portionengaging the movable portion of said diaphragm whereby said reflectormoves responsive to the vibrations of said diaphragm.

10. In combination, an .electrically-operated speaker having a vibratorydiaphragm restrained 7E against movement at its peripheral margin and apole-piece adjacent the center of the diaphragm and relative to whichthe diaphragm-is movable, and a structure, comprising a reflector,secured at one portion to said pole-piece and at another portionengaging said diaphragm between itsreflector is moved responsive 'tothevibrations oi.

the diaphragm.

12. In combination, an electrically-operated speaker having a flexiblediaphragm,'means ion actuating the speaker for the production oiaudiblesound," means for producing a light beam and means actuated bysaid speaker tor causing said light beam to produce, simultaneously, andin synchronism, with the production of the sound waves by the movements01 said diaphragm, a delineation, in the form of a wave line andobservable simultaneously with the production oi the audible sound, ofthe waves of current supplied to said speaker.

13. In combination, an electrically-operated speaker having a flexiblediaphragm. means for actuating the speaker for the production oi audiblesound, means for producing a light beam and means actuated by saidspeaker ior causing said light beam. to produce,.simultaneously, and insynchronism, with the production of the sound waves by the movements ofsaid diaphragm,'an indication visual simultaneously with the productionof the sound waves of the waves of current supplied to said speaker. 514. In combination, an electrically-operated, speaker having a flexiblediaphragm,means for actuating the speaker for the production of audiblesound, means for producinga light'beam and means actuatedby said speakerior causing 10 said light beam. to produce, simultaneously, and insynchronism, with the production oi the sound waves by the movements orsaid diaphragm, a delineation, in the form of a wave line and observablesimultaneously with the production of the g audible sound, oi,the waves01' current supplied to said-speaker comprising a reflector in the pathof said light beam and movable responsive to the vibrations produced bythe s 15. In combination, an electrically-operated go speaker having avibratory element, means for actuating the speaker, means for producinga light beam,.and means actuated by said element for causing said lightbeam to produce simultaneously, and in synchronism,with the vibrationsg5. 01' said element. adelineation in the form of a wave line andobserivable simultaneously withthe vibrations of said element, of thewaves oi the current supplied to the speaker.

16'. In combination, an electrically-operated speaker having a vibratorydiaphragm. means for actuating the speaker, means for producing a lightbeam, and means actuated by said dia .phragm ior causingsa'id lightbeemto produce simultaneously, and in s'ynchronhm with the vi-'brations'o! said diaphragm, a delineation in the form are wave line andobservable simultaneously with the vibrations of said diaphragm, oithewavesoi'currentsuppliedtothespeaker.

wrnuau a. mans,

